gcc: patch gccgo on musl to allow usage of freestanding libucontext

srcpkgs/gcc/files/gccgo-musl.patch

@@ -1,6 +1,9 @@
 This is not among the normal patches as these changes are musl specific and
 there is no way to easily conditionalize it in source for some of the changes.
 
+Added by q66: runtime.h now uses libucontext_ prefixed APIs to allow build
+with freestanding versions of libucontext
+
 Souurce: Adélie Linux, q66
 URL: https://code.foxkit.us/adelie/packages/tree/master/system/gcc
 
@@ -186,6 +189,25 @@ URL: https://code.foxkit.us/adelie/packages/tree/master/system/gcc
  	  {
  		mcontext_t *m = &((ucontext_t*)(context))->uc_mcontext;
  		int i;
+--- libgo/runtime/runtime.h
++++ libgo/runtime/runtime.h
+@@ -500,10 +500,13 @@ int __go_setcontext(__go_context_t*);
+ void __go_makecontext(__go_context_t*, void (*)(), void*, size_t);
+ #else
+ #define __go_context_t	ucontext_t
+-#define __go_getcontext(c)	getcontext(c)
+-#define __go_setcontext(c)	setcontext(c)
++int  libucontext_getcontext(__go_context_t *);
++void libucontext_makecontext(__go_context_t *, void (*)(), int, ...);
++int  libucontext_setcontext(const __go_context_t *);
++#define __go_getcontext(c)	libucontext_getcontext(c)
++#define __go_setcontext(c)	libucontext_setcontext(c)
+ #define __go_makecontext(c, fn, sp, size) \
+-	((c)->uc_stack.ss_sp = sp, (c)->uc_stack.ss_size = size, makecontext(c, fn, 0))
++	((c)->uc_stack.ss_sp = sp, (c)->uc_stack.ss_size = size, libucontext_makecontext(c, fn, 0))
+ #endif
+ 
+ // Symbols defined by the linker.
 --- libgo/sysinfo.c
 +++ libgo/sysinfo.c
 @@ -73,9 +73,6 @@

srcpkgs/gcc/template

@@ -46,11 +46,6 @@ case "$XBPS_TARGET_MACHINE" in
 	mips*-musl|ppc*) _have_gccgo=no ;;
 esac
 
-# FIXME
-if [ -n "$CROSS_BUILD" -a "$XBPS_TARGET_LIBC" = "musl" ]; then
-	_have_gccgo=no
-fi
-
 if [ "$CHROOT_READY" ]; then
 	hostmakedepends="tar texinfo perl flex"
 else